Application of LCD. Performance COST. Mobile phone. Polatechno. Watch. Calculator. Auto motive Navigation. Monitor. Color.

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Aubrey Edwards
6 years ago
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1 Application of LCD Performance TV COST Color Note PC Monitor Auto motive Navigation Mobile phone Watch Monochrome Calculator

2 Structure of TN-LCD TN-LCD Transmittance type LC molecules are switched by electric field ~ LC molecules Polarizer

3 Function of polarizer Change to linear polarization from natural light Light is absorbed into polarizer and it s a function as light shutter Control of hue

4 Kind of polarizer Kinds Absorption Non-absorption Type Iodine Dyestuff Reflective polarizer (3M DBEF) Chorestelic LC coating is producing absorption type polarizer.

5 Natural light P waves Light wave is vibrating S waves Natural light has all directions

6 Characteristics of polarizer Absorption axis In this case, S waves is absorbed into Polarizer, because it is same direction of S waves direction and absorption axis. However, P waves pass through Polarizer This passed light becomes linear polarized light.

7 Characteristics of polarizer P waves Polarizer Liner polarized light S waves

8 Polarizer manufacturing process 1. PT process: Surface treatment of TAC film (PT=Pre-Treatment) Alkali liquid Drier TAC roll (Tri Acetyl cellulose) The purpose of PT process is increase the adhesion force between TAC and polarizer element(pva) in after process.

9 2. 1 Stretching process PVA film contains iodine or dyestuff to have absorbing function, and it s stretched for make uniform. PVA roll (Polyvinyl Alcohol) Swelling Dyeing Stretching Drier Before stretch After stretch PVA alignment: Random PVA alignment: Uniformity

10 Orientation of iodine polarizer I I I - PVA molecules I I I I I - I I I - Absorption axis Iodine makes complex of I 3- and I 5-,and aligned one-way in PVA molecules by stretching process.

11 Orientation of dyestuff PVA molecule Dyestuff Dyestuff Dyestuff Dyestuff Absorption axis Dyestuff aligned one-way in PVA molecule by stretching process.

12 2. 2 lamination with TAC and polarizer element Polarizer element (PVA) is weak against moisture or thermal, therefore it must be protected by two TAC films with PT process. Adhesive glue Adhesive glue TAC (Supporter) PVA (Polarizer element) TAC (Supporter) PVA Adhesive glue TAC Drier Protection film Polarizer Adhesive glue TAC Protection film

13 3. Coating process Pressure sensitive adhesive (PSA) is coated on polarizer. This PSA is usually used with attach on surface of cell. Polarizer Drier Coater PSA Product Separator

14 Other process Lamination of another function films (Retardation film,reflector, Transflector etc.) Chip cut (Cut the polarizer from sheet to chip) Inspection of appearance

15 Structure of polarizer Absorption axis Protection film TAC PVA(Polarizer element) TAC PSA (Adhesive) Separator

16 Product Group Iodine Dyestuff Character General Purpose LN Paper white color SKW High-Contrast KN Super High-contrast SKN Super High-contrast & neutral color SKE High durable THC Super high durable & high Contrast Super high durable & Paper white Grade Optical Properties Transmission (%) Polarizer Efficiency (%) SHC SHC Durability Wet condition Dry contition 40degC x 95%RH 70degC 40degC x 95%RH 80degC 60degC x 90%RH 80degC 60degC x 90%RH 85degC 60degC x 90%RH 85degC 80deg x 90%RH 100degC 80deg x 90%RH 105degC 80deg x 90%RH 105degC Application Watcth,Calculator, Mobile phone(mono) etc. Auto motive, Mobile phone(color), Note PC etc. Mobile phone(color) etc. Auto motive etc. Automotive, Navigation etc. Auto motive, Outdoor meter etc.

17 Additional function Polarizer is possible to combine additional functions accordingly to purpose. Anti scratch Anti glare Anti reflection -> Hard Coating (HC) -> AG coating -> AR :Dry vacuum deposition -> LR :Coating Reflective display -> Reflector Transflective display-> Transflector STN display etc. -> Retarder Brightness enhance -> DBEF film Wide view angle for TN-TFT -> WV film etc.

18 Hard coating(hc) Anti scratch and resistance to chemicals. Pencil hardness Steal wool scuffing HC layer

19 Anti Glare (AG) Light is reflected by surface of Polarizer. This reflective light is not scattering. Dazzling! Polarizer surface without AG layer Reflective light is scattered by roughness on surface of Polarizer. Good!! Polarizer surface with AG layer Very tiny roughness

LCD DISPLAY TECHNOLOGY. Digital Images and Pixels

LCD DISPLAY TECHNOLOGY. Digital Images and Pixels LCD DISPLAY Figures are courtesy of 3M TECHNOLOGY Modified'by' Asst.Prof.Dr.'Surin'Ki6tornkun' Computer'Engineering,'KMITL' 1 Digital Images and Pixels A digital image is a binary (digital) representation